Treated Timber Joist 47 x 200mm C24
Treated Timber Joists offer a strong, dependable, and versatile solution for a wide range of structural construction projects. Often referred to as softwood carcassing timber, these joists are strength-graded to C24, ensuring superior load-bearing capacity and performance for demanding building applications.
Each timber joist is pressure treated to improve resistance against moisture and fungal decay, making it suitable for above-ground use where there is an occasional risk of wetting. The wood is planed and regularised, giving it a smooth, uniform surface with eased edges for easier handling and a cleaner finish during installation.
The joists are also kiln-dried, reducing moisture content to a stable level to enhance durability, minimise warping, and improve overall strength. Available in a range of lengths from 3.0m to 6.0m, this C24 timber is ideal for use in flooring, roofing, wall framing, and general carcassing.
Responsibly sourced and PEFC 70% certified, these treated joists are not only built to last but also produced with sustainability in mind — making them the go-to choice for professional builders and DIY users alike.
Key Specifications
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Section Size: 47 x 200mm
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Finished Size (Approx.): 45 x 195mm
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Lengths Available: 3.0m, 3.6m, 4.2m, 4.8m, 6.0m
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Grade: C24 (Structural)
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Treatment: Pressure Treated for durability
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Finish: Planed and Regularised with Eased Edges
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Moisture Content: Kiln Dried for stability
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Certification: 70% PEFC Certified
FAQs
What does C24 mean in timber grading?
C24 is a premium structural grade that signifies superior strength and quality. It can withstand higher loads and is commonly used in applications like flooring, roofing, and framework construction where strength and consistency are essential.
Can C24 treated timber be used outside?
Yes, this timber is suitable for exterior use in areas that may experience occasional wetting, such as outdoor framing or decking structures. However, it should not be used in direct ground contact unless specifically rated for that purpose.
Why is kiln drying beneficial for treated timber?
Kiln drying reduces the timber’s moisture content, improving its dimensional stability and resistance to twisting or cracking. It also helps the treatment penetrate more effectively, ensuring longer-lasting protection and structural integrity.
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